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Mirrors > Home > MPE Home > Th. List > hashnncl | Structured version Visualization version GIF version |
Description: Positive natural closure of the hash function. (Contributed by Mario Carneiro, 16-Jan-2015.) |
Ref | Expression |
---|---|
hashnncl | ⊢ (𝐴 ∈ Fin → ((#‘𝐴) ∈ ℕ ↔ 𝐴 ≠ ∅)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nnne0 11053 | . . 3 ⊢ ((#‘𝐴) ∈ ℕ → (#‘𝐴) ≠ 0) | |
2 | hashcl 13147 | . . . . . 6 ⊢ (𝐴 ∈ Fin → (#‘𝐴) ∈ ℕ0) | |
3 | elnn0 11294 | . . . . . 6 ⊢ ((#‘𝐴) ∈ ℕ0 ↔ ((#‘𝐴) ∈ ℕ ∨ (#‘𝐴) = 0)) | |
4 | 2, 3 | sylib 208 | . . . . 5 ⊢ (𝐴 ∈ Fin → ((#‘𝐴) ∈ ℕ ∨ (#‘𝐴) = 0)) |
5 | 4 | ord 392 | . . . 4 ⊢ (𝐴 ∈ Fin → (¬ (#‘𝐴) ∈ ℕ → (#‘𝐴) = 0)) |
6 | 5 | necon1ad 2811 | . . 3 ⊢ (𝐴 ∈ Fin → ((#‘𝐴) ≠ 0 → (#‘𝐴) ∈ ℕ)) |
7 | 1, 6 | impbid2 216 | . 2 ⊢ (𝐴 ∈ Fin → ((#‘𝐴) ∈ ℕ ↔ (#‘𝐴) ≠ 0)) |
8 | hasheq0 13154 | . . 3 ⊢ (𝐴 ∈ Fin → ((#‘𝐴) = 0 ↔ 𝐴 = ∅)) | |
9 | 8 | necon3bid 2838 | . 2 ⊢ (𝐴 ∈ Fin → ((#‘𝐴) ≠ 0 ↔ 𝐴 ≠ ∅)) |
10 | 7, 9 | bitrd 268 | 1 ⊢ (𝐴 ∈ Fin → ((#‘𝐴) ∈ ℕ ↔ 𝐴 ≠ ∅)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 196 ∨ wo 383 = wceq 1483 ∈ wcel 1990 ≠ wne 2794 ∅c0 3915 ‘cfv 5888 Fincfn 7955 0cc0 9936 ℕcn 11020 ℕ0cn0 11292 #chash 13117 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906 ax-un 6949 ax-cnex 9992 ax-resscn 9993 ax-1cn 9994 ax-icn 9995 ax-addcl 9996 ax-addrcl 9997 ax-mulcl 9998 ax-mulrcl 9999 ax-mulcom 10000 ax-addass 10001 ax-mulass 10002 ax-distr 10003 ax-i2m1 10004 ax-1ne0 10005 ax-1rid 10006 ax-rnegex 10007 ax-rrecex 10008 ax-cnre 10009 ax-pre-lttri 10010 ax-pre-lttrn 10011 ax-pre-ltadd 10012 ax-pre-mulgt0 10013 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3or 1038 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-nel 2898 df-ral 2917 df-rex 2918 df-reu 2919 df-rab 2921 df-v 3202 df-sbc 3436 df-csb 3534 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-pss 3590 df-nul 3916 df-if 4087 df-pw 4160 df-sn 4178 df-pr 4180 df-tp 4182 df-op 4184 df-uni 4437 df-int 4476 df-iun 4522 df-br 4654 df-opab 4713 df-mpt 4730 df-tr 4753 df-id 5024 df-eprel 5029 df-po 5035 df-so 5036 df-fr 5073 df-we 5075 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 df-pred 5680 df-ord 5726 df-on 5727 df-lim 5728 df-suc 5729 df-iota 5851 df-fun 5890 df-fn 5891 df-f 5892 df-f1 5893 df-fo 5894 df-f1o 5895 df-fv 5896 df-riota 6611 df-ov 6653 df-oprab 6654 df-mpt2 6655 df-om 7066 df-1st 7168 df-2nd 7169 df-wrecs 7407 df-recs 7468 df-rdg 7506 df-1o 7560 df-er 7742 df-en 7956 df-dom 7957 df-sdom 7958 df-fin 7959 df-card 8765 df-pnf 10076 df-mnf 10077 df-xr 10078 df-ltxr 10079 df-le 10080 df-sub 10268 df-neg 10269 df-nn 11021 df-n0 11293 df-z 11378 df-uz 11688 df-fz 12327 df-hash 13118 |
This theorem is referenced by: hashge1 13178 lennncl 13325 lswlgt0cl 13356 wrdind 13476 wrd2ind 13477 incexc 14569 incexc2 14570 ramub1 15732 gsumwmhm 17382 psgnunilem5 17914 psgnunilem4 17917 gexcl2 18004 sylow1lem3 18015 sylow1lem5 18017 pgpfi 18020 pgpfi2 18021 sylow2alem2 18033 sylow2blem3 18037 slwhash 18039 fislw 18040 sylow3lem3 18044 sylow3lem4 18045 efgsp1 18150 efgsres 18151 efgredlem 18160 lt6abl 18296 ablfacrp2 18466 ablfac1lem 18467 ablfac1b 18469 ablfac1c 18470 ablfac1eu 18472 pgpfac1lem2 18474 pgpfac1lem3a 18475 pgpfaclem2 18481 ablfaclem3 18486 lebnumlem3 22762 birthdaylem3 24680 birthday 24681 amgmlem 24716 amgm 24717 musum 24917 dchrabs 24985 dchrisum0flblem1 25197 cusgrrusgr 26477 wlkiswwlksupgr2 26763 frgrreg 27252 tgoldbachgtda 30739 derangfmla 31172 erdszelem2 31174 rrndstprj2 33630 rrncmslem 33631 rrnequiv 33634 isnumbasgrplem3 37675 fzisoeu 39514 fourierdlem54 40377 fourierdlem103 40426 fourierdlem104 40427 qndenserrnbllem 40514 ovnhoilem1 40815 hoiqssbllem1 40836 hoiqssbllem2 40837 hoiqssbllem3 40838 vonsn 40905 amgmlemALT 42549 |
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